Declare GIL not used

Author: rhpvorderman

src/zlib_ng/zlib_ngmodule.c

@@ -2969,6 +2969,9 @@ PyMODINIT_FUNC
 PyInit_zlib_ng(void)
 {
     PyObject *m, *ver;
+#ifdef Py_GIL_DISABLED
+    PyUnstable_Module_SetGIL(m, Py_MOD_GIL_NOT_USED);
+#endif
     m = PyModule_Create(&zlibmodule);
     if (m == NULL) {
         return NULL;